Metal-turning tool.



J. HARTNESS.

METAL TURNING TOOL.

APPLICATION FILED JULY 30, 1912 Patented Mar. 2, 1915.

3 SHEETS-SHEET 1.

Inventor: 84mm. q'eolwuw J. HARTNESS.

METAL TURNING TOOL.

APPLIGATION FILED JULY 30, 1912.

1,1 30,274. Patented Mar. 2, 1915.

S SHEETS-SHEET 2 u/j/neases to U6 Hi0? J. HARTNESS. METAL TURNING TOOL.

APPLIOATIONTILED JULY 80, 1912. 1,1 30,274, Patented Mar. 2, 1915.

3 SHEETS-SHEET 3.

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JAMES HARTNESS, OF SPRINGFIELD, VER'MONT.

METAL-TURNING TOOL.

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Specification of Letters Patent.

Patented Mar. 2, 1915.

Original application filed. November 17, 1908, Serial No. 463,002. Divided and this application filed July 30, 1912. Serial No. 712,264.

To all whom it may concern:

Be it known that 1, JAMES HARTNESS, a citizen of the United States, and resident of Springfield, in the county of Windsor and State of Vermont, have invented certain new and useful Improvements in Metal- Turning Tools, (Case A,) of which the following is a specification.

This invention has relation to metal cutting or turning tools and has for its object to provide certain improvements in work rests, in consequence of which they may be rapidly adjusted to predetermined positions for work of different diameters.

Referring to the drawings, Figure 1 represents in end elevation a turning tool equipped with the invention. Fig. 2 represents a plan view of the same. Fig. 3 represents a vertical section through the tool. Fig. t represents a portion of the body of the tool with one of the rests removed. Fig. 5 represents a longitudinal section through the tool. Fig. 6 represents a somewhat similar section taken through the work rest on the line 6-6 of Fig. 1.

- Fig. 7 comprises two views illustrating one of the work rests detached. Fig. 8 represents a section through a portion of the body to illustrate one of the slots and its enlargement.

The tool is illustrated as comprising a frame or body 25 which consists of a standard having a base 27 adapted to be secured by any suitable means to the tool slide of a lathe. In the standard of the body portion there is an aperture through which the work may pass as shown in Figs. 1 and 3. Attached to the body is a rest holder 26 shaped somewhat like the letter C and provided with apertures 28 to receive dowels 29 which project from the base of the standard of the body portion. The holder 26 fits tightly against the face of the standard and fits friction tight on the dowels 28 and 29, and it is also held in position by the thrust of the work against the cutter. The holder 26 serves as a carrier or support for the work rests and to it is pivoted the cutter carrier.

The work rests are indicated at 30. They are illustrated as two in number and they are located so as to resist the upward and lateral thrust of the work. Each rest consists of a rotatable member or disk having a concentric shank 31. The disk and its shank are journaled in a socket or bearing member which consists of a sleeve r bushing 32 arranged in a cylindrical aperture 33 formed in the holder 26. The shanks are held removably in place by split spring rings 311 sprung into circumferential grooves and bearing against the interior walls of the sleeves. The disk and the end of the sleeve or bushing are complementally beveled, as shown in Fig. 6. The apertures 32 in the rest support are approximately radial with respect to the work aperture and are at an inclination to the axis of the work, as clearly indicated in Figs. 5 and 6, and consequently the end face of each wor; rest is beveled as shown, the middle of the face being slightly recessed so that only the upper portion of the face will engage the periphery of the work. The outer ends of the shanks 31 rest against end thrust bearings or pins 3% which in turn bear against transverse pins 35 passed through the projecting ends of the sleeves 32. The laterally projecting ends of the pins 35 are provided with knobs 36 which constitute handles by which the sleeves may be rotated or oscillated.

By an examination of Fig. 7, it will be observed that each sleeve 32 is provided with a laterally projecting rib 37. By an examination of Figs. 2, 3 and 4:, it will be further observed that communicating with the apertures 33 there are slots 38 and enlargements 39, so that, when each rest and its sleeve is inserted in the holder 26 of the tool, the rib may pass downwardly through the slot 38 into the enlargement 39 of the recess, and thereafter the sleeve 32 may oscillate about its axis to a limited extent in one direction or the other. The rib 37 forms a stop member which may be caused to register with and engage the end of any one of a plurality of abutments, which in the present case take the form of set screws 40. These abutment screws are passed downwardly through threadpd apertures in the body portion 26 into the enlargements 39 of the sockets 33 and they are so located that by oscillating and longitudinally moving the sleeve 32 the rib or stop 37 may be engaged with the end of either one of them. The handle pin 35 is slightly cut away as at 42 (see Fig. 1), and it projects from the sleeve in parallelism with the upper surface or top of the rib or stop 37,

the distance between the rib and the handle being equivalent to the length of each of the abutment screws 40. Consequently, when the stop member or rib 37 is engaged with one of the abutment screws, the handle will engage the head of the screw with -sufficient pressure or tension to hold the .sleeve 32 against accidental oscillation. The two screws 40 are preferably setin diiferent positions so that a rapid adjustment of each of the .work rests to a predetermined position isprovided. As a matter of detail, it may be stated that a lubricant .is supplied to the work rests through a duct 43 in the body portion 25 of the tool, said duct communicating with the socket 33 by ducts 44 as shown in dotted lines in Fig. 1, the

sleeves having apertures to receive the lubrip nt- From the foregoingvdescription, it will be observed that work rests are provided which are partial rolling and partial sliding contact with the work, and yet which are securely held against vibration or against end-wise movement, in consequence of which am able to secure a most rigid support for the work.

In order that the abutment screws may be held securely after adjustment,flI provide means for locking them all in place.

therein pins 45, which may be forced longitudinally into engagement with the screws 40. The ends of the'pins converge as shown Fig. l and project outwardly from the holder 26 so that they may be engaged by a beveled bar 46. The latter is apertured to receive a screw 47 which is passed loosely therethrough into threaded engagement with the holder 26. By loosening the screw 47, the pins 45 are released so as to permit the adjustmentof the Screws 40; and by forcing the screw 47 inward, the pins 45 are driven firmly against the screws 40 so as to lock them all simultaneously against accidental movement or rotation.

The cutter carrier is indicated at 48 and vneed not be herein described specifically as it is clearly illustrated and described in my co-pending, application Serial No. 468,002,.

filed November. 17, 1908, of which this is a division. It may suffice to say that said outter carrier 48 is pivoted upon a screw pin 52 so that the cutter carrier may be swung toward and from the work. Upon the cutter carrier, there is located a cutter 57 which consists of an elongated bar having at one end a longitudinal cutting edges Said cutter. bar is secured in place by any convenient means which forms'no part of the invention herein claimed. The means by which the cutter carrier maybe swung into and out of operative position comprises a pivotal member, such as a yoke 77- having par l el side' This is accomplished conveniently by providing diverging holes in the holder 26 and locating claim is bars 78 which straddle the cutter carrier 48.

A pivot pin 79, having an eccentric sleeve 80 rigidly connected therewith, pivots the yoke to the cutter block. A handle 81 is secured to the pivot pin 79, so that, by rock- Through gaged with a hardened socket piece 84 set in a projecting porti-on-gor armof the body" 26. The two set screws 82, 83 are secured after adjustment by pins 86 and set screws 87 passed laterally into the end bar of the yoke, as shown in Fig. 2Q According to the diameter of thework to be turned, the screw 82 or the screw 83 will be engaged with the socket piece 84.. As illustrated in Fig. 1, the cutter is in a position to act upon the work. 7 To withdraw it, the handle :81 may be swung to the right to swing the carrier about the pivot pin outwardly and downwardly, after which the yoke may be lifted so as to dis engage the screw 82 from the socket piece 84 and the yoke swung bodily to the right to permit the cutter carrier to drop. For ordinary purposes, however, it is sufficient to move the cutter carrier toward and from the work byswinging the handle 81 about its axis. a

From the foregoing description it will be observed that there are two abutmentsor members fordetermining with accuracy the locations of. each of the work rests and of the cutter. This makes it possible .to secure a rapid adjustment of theseparts for-turning two diameters on the work. .It fre quently happens that work is shouldered between its ends and that the cutter must be located first in one position to turn a portion of the Work, and then adjusted to turn the remainder. 'The operative first adjusts the abutments separately to predetermined positions according to the diameters to be turned, and thereafter is able to rapidly ad-- just andlocate the cutter and the work rests in exact positions, as will be well understood by persons familiar withtheart of metal turning. .7

Having thus explained the nature of-my saidinvention and in what manner the same may be performed, without attempting to describe all of the forms in which it may be made or all of the modes of .itsuse, what I 1. In a metaleturning tool, a frame havinga passageway for the work, a cutter carrier pivoted to the frame, a cutter thereon approximately radial with respect to said passageway, "a member pivoted to thecutter carrier, and adapted: to engage said frame to support the cutter carrier, one or more rotatable work rests arranged with their axes approximately radial with respect to saidpassageway, and a plurality ofgsets-ofabutments, one set for each Work rest and one set for the said pivoted member, whereby the cutter and the work rests are adapted to be located in predetermined positions.

2. In a metal-turning tool, the combination with a frame having a work-receiving passageway, and a cutter carrier connected with said frame, of a rotatable and axially adjustable work rest on the frame arranged approximately radially with respect to said passageway, and a plurality of abutments by any one of which the work rest may be located and held against axial movement.

3. In a metal-turning tool, the combination with a frame having a work-receiving passageway, and a cutter carrier connected with said frame, of a rotatable and axially adjustable work rest on the frame arranged approximately radially with respect to said passageway, a socket member therefor having a lateral projection, and an abutment for engaging said projection to hold said socket member against axial movement.

4. In a metal-turning tool, the combination with a frame having a work-receiving passageway, and a cutter carrier connected with said frame, of a rotatable and axially adjustable Work rest on the frame arranged approximately radially with respect to said passageway, a socket member therefor having a lateral projection, and a plurality of abutments with any one of which said lateral projection may be engaged to position the work rest.

5. In a metal-turning tool, the combination with a frame having a work-receiving passageway, and a cutter carrier connected to said frame, of a plurality of rotatable work rests arranged on said frame and approximately radial with respect to said passageway, and a plurality of abutments for each work rest for positioning it axially.

6. In a metal-turning tool, the combination with a frame having a work-receiving passageway, and a cutter carrier connected to said frame, a socket member arranged approximately radially with respect to said passageway, a rotatable work rest journaled therein and having an end work-engaging face, separated lateral projections on the socket member, and a plurality of abutments adjacent said socket member, any one of which is adapted to be engaged by both of said lateral projections to hold said socket member against axial movement in either direction.

In testimony whereof I have aflixed my signature, in presence of two witnesses.

JAMES HARTNESS.

WVitnesses:

H. E. IRVING, J. W. WALKER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, I). G. 

